### Civil Engineering - Surveying MCQs Part 1

1. Hydrographic surveys deal with the mapping of

A.
large water bodies
B.
heavenly bodies
C.
mountaineous region
D.
canal system
E.
movement of clouds.

2. If h is the difference in level between end points separated by l, then the slope correction is . The second term may be neglected if the value of h in a 20 m distance is less than

A.
m
B.
1 m
C.
2 m
D.
3 m

3. An ideal vertical curve to join two gradients, is

A.
circular
B.
parabolic
C.
elliptical
D.
hyperbolic
E.
none of these.

4. Pick up the correct statement from the following :

A.
the eyepiece plays no part in defining the line of sight
B.
the diaphragm plays no part in defining the line of sight
C.
the optical centre of the objective plays no part in defining the line of sight
D.
none of these.

5. The intercept of a staff

A.
is maximum if the staff is held truly normal to the line of sight.
B.
is minimum if the staff is held truly normal to the line of sight.
C.
decreases if the staff is tilted away from normal
D.
increases if the staff is tilted towards normal.

6. The radius of curvature of the arc of the bubble tube is generally kept

A. 10 m
B. 25 m
C. 50 m
D. 100 m

7. If S is the length of a subchord and R is the radius of simple curve, the angle of deflection between its tangent and sub-chord, in minutes, is equal to

A. 573 S/R
B. 573 R/S
C. 171.9 S/R
D. 1718.9 R/S
E. 1718.9 S/R.

8. The real image of an object formed by the objective, must lie

A. in the plane of cross hairs
B. at the centre of the telescope
C. at the optical centre of the eye-piece
D. anywhere inside the telescope.

9. In chain surveying tie lines are primarily provided

A. to check the accuracy of the survey
B. to take offsets for detail survey
C. to avoid long offsets from chain lines
D. to increase the number of chain lines.

10. Pick up the correct statement from the following :

A. the tangent screw enables to give small movement under conditions of smooth and positive control
B. standing on the tripod is the levelling head or trib arch
C. the levelling screws are used to tilt the instrument so that its rotation axis is truly vertical
D. all the above.

11. One of the Lehmann's rules of plane tabling, is

A. location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances
B. when looking in the direction of each of the given points, the instrument station will be on the right side of one and left side of the other ray
C. when the instrument station is outside the circumscribing circle its location is always on the opposite side of the ray to the most distant point as the inter-section of the other two rays
D. none of these.

12. If f1 and f2 are the distances from the optical centre of a convex lens of focal length f to conjugate two points P1 and P2 respectively, the following relationship holds good

A. f = f1 + f2
B. f = (f1 + f2)
C.
D. none of these.

13. The accuracy of measurement in chain surveying, does not depend upon

A. length of the offset
B. scale of the plotting
C. importance of the features
D. general layout of the chain lines.

14. If arithmetic sum of latitudes of a closed traverse is ∑Lat and closing error in latitude is dx, the correction for a side whose latitude is l, as given by Transit Rule, is

A.
B.
C.
D. none of these.

15. Closed contours of decreasing values towards their centre, represent

A. a hill
B. a depression
D. a river bed.

16. If a 30 m chain diverges through a perpendicular distance d from its correct alignment, the error in length, is

A.
B.
C.
D.
E. .

17. Diopter is the power of a lens having a focal length of

A. 25 cm
B. 50 cm
C. 75 cm
D. 100 cm
E. 125 cm

18. An imaginary line joining the points of equal elevation on the surface of the earth, represents

A. contour surface
C. contour line
D. level line
E. none of these.

19. The 'fix' of a plane table station with three known points, is bad if the plane table station lies

A. in the great triangle
B. outside the great triangle
C. on the circumference of the circumscribing circle
D. none of these.

20. If R is the radius of the main curve, θ the angle of deflection, S the shift and L the length of the transition curve, then, total tangent length of the curve, is

A. (R - S) tan θ/2 - L/2
B. (R + S) tan θ/2 - L/2
C. (R + S) tan θ/2 + L/2
D. (R - S) tan θ/2 + L/2
E. (R - S) cos θ/2 + L/2

21. In chain surveying field work is limited to

A. linear measurements only
B. angular measurements only
C. both linear and angular measurements
D. all the above.

22. Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is

A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm

23. If θ is the vertical angle of an inclined sight, δ is the angle of tilt of the staff, the error

A.
B.
C.
D. none of these.

24. One of the tacheometric constants is additive, the other constant, is

A. subtractive constant
B. multiplying constant
C. dividing constant
D. indicative constant.

25. The limiting length of an offset does not depend upon

A. accuracy of the work
B. method of setting out perpendiculars
C. scale of plotting
D. indefinite features to be surveyed.

26. In quadrantal bearing system, back bearing of a line may be obtained from its forward bearing, by

A. adding 180°, if the given bearing is less than 180°
B. subtracting 180°, if the given bearing, is more than 180°
C. changing the cardinal points, i.e. substituting N for S and E for W and vice-versa
D. none of these.

27. If L is the perimeter of a closed traverse, ΔD is the closing error in departure, the correction for the departure of a traverse side of length l, according to Bowditch rule, is

A.
B.
C.
D. .

28. Pick up the correct statement from the following:

A. the theodolite in which telescope can be rotated in vertical plane is called a transit
B. when the vertical circle is to the left of the telescope during observation, it is called to be in left face
C. when the vertical circle is to the right of the telescope during observation, it is called to be in right face
D. all the above.

29. Pick up the method of surveying in which field observations and plotting proceed simultaneously from the following

A. chain surveying
B. compass surveying
C. plan table surveying
D. tacheometric surveying.

30. While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is

A. correctly focussed
B. not correctly focussed
C. said to have parallax
D. free from parallax.

31. Accuracy of 'fix' by two point problem, is

B. good
C. not reliable
D. unique.

32. A bearing of a line is also known as

A. magnetic bearing
B. true bearing
C. azimuth
D. reduced bearing

33. True meridians are generally preferred to magnetic meridians because

A. these converge to a point
B. these change due to change in time
C. these remain constant.
D. None of these.

34. Pick up the correct statement from the following :

A. the apparent error on reversal is twice the actual error
B. the correction may be made equal to half the observed discrepancy.
C. the good results may be obtained from a defective instrument by reversing and taking the mean of two erroneous results
D. all the above.

35. If θ is the slope of the ground and l is the measured distance, the correction is

A. 2l sin2 θ/2
B. 2l cos2 θ/2
C. 2l tan2 θ/2
D. 2l cot2 θ/2.

36. The most reliable method of plotting a theodolite traverse, is

A. by consecutive co-ordinates of each station
B. by independent co-ordinates of each station
C. by plotting included angles and scaling off each traverse leg
D. by the tangent method of plotting.

37. The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to

A. the distance between the zero of gradient and the foot of the staff
B. twice the distance between the zero of graduation and the foot of the staff
C. thrice the distance between the zero of graduation and the foot of the staff
D. none of the above.

38. Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to

A. 14.14
B. 28.28 m
C. 200 m
D. none of these.

39. The probable error of the adjusted bearing at the middle is

A. rn
B. rn
C. rn
D. rn.

40. The bearings of the lines AB and BC are 146° 30' and 68° 30'. The included angle ABC is

A. 102°
B. 78°
C. 45°
D. none of these.

41. For a closed traverse the omitted measurements may be calculated

A. length of one side only
B. bearing of one side only
C. both length and bearing of one side
D. length or bearing of adjacent side
E. all the above.

42. The slope correction for a length of 30 m along a gradient of 1 in 20, is

A. 3.75 cm
B. 0.375 cm
C. 37.5 cm
D. 2.75 cm.

43. The main principle of surveying is to work

A. from part to the whole
B. from whole to the part
C. from higher level to the lower level
D. from lower level to higher level.

44. For the construction of highway (or railway)

A. longitudinal sections are required
B. cross sections are required
C. both longitudinal and cross sections are required
D. none of these.

45. If the radius of a simple curve is R, the length of the chord for calculating offsets by the method of chords produced, should not exceed.

A. R/10
B. R/15
C. R/20
D. R/25.

46. The sensitiveness of a level tube decreases if

A. radius of curvature of its inner surface is increased
B. diameter of the tube is increased
C. length of the vapour bubble is increased
D. both viscosity and surface tension are increased.

47. For true difference in elevations between two points A and B, the level must be set up

A. at any point between A and B
B. at the exact mid point of A and B
C. near the point A
D. near the point B.

48. ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is

A. 90°
B. 120°
C. 210°
D. 270°

49. Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than

A. 30 m
B. 25 m
C. 20 m
D. 15 m

50. Pick up the correct statement from the following :

A. Box sextant is used for the measurement of horizontal angles
B. Cross staff is used for setting out right angles
D. Line ranger is used for locating intermediate stations on a survey line
E. All the above.